On some Leptiles and a Frog from Argentina, 365 
XXXI1X.—WNote on some Reptiles and a Frog from Argentina. 
By Dr. A. GUNTHER, F.R.S. 
I HAVE received from Falkland Ricketts, Esq., a small 
collection of Reptiles which he made in Santa Fé, It con- 
tained three lizards (Ameiva surinamensis, Anisolepis undu- 
latus, and Lepidosternum affine), eight snakes (Pseudablabes 
Agassizit, Liophis pecilogyrus, Xenodon rhabdocephalus [or 
X. Merremii, Wagl.?, Boul., Peracca], Thamnodynastes 
Natterert, Philodryas Schotti, Philodryas psammophideus, 
Oxyrhopus rhombifer, and Lachesis alternatus), and one frog, 
which | consider to be a distinct and undescribed species. 
The specimen of Andsolepis undulatus, which species is 
still a desideratum to the majority of collections, is unfortu- 
nately not in a good state of preservation. The Amphis- 
beenian is, without doubt, 
Lepidosternum affine, Bottger. 
I do not consider Z. Boettger?, Boul. Lizards, ii. p. 466, 
from Corrientes, to be distinct from Béttger’s species, and 
probably both are identical with Strauch’s L. Griinthert. 
The specimen in Mr. Ricketts’s collection is of nearly the 
same size as the type of L. Boettgert. It has 254 annuli of 
the body and 14 of the tail; an annulus contains 80 dorsal 
and 26 ventral segments. ‘There are 6 well-formed preanal 
segments, with a minute rudimentary one on each side. In 
L. Boettgeri I count 7, 3 on one and 4 on the other side. 
Also the shape and arrangement of the parietal and occipital 
shields seem subject to abnormal asymmetry and individual 
variation. In our specimen they are more symmetrical than 
in the type of L. Boetigert, the parietal being broader than 
long (one more so than the other) and the occipital not quite 
twice as broad as long. 
I dedicate the new tree-frog to the collector, naming it 
Phyllomedusa Rickettsit, sp. n. 
Parotoids large, rather longer than the head, commencing 
from above the middle of the eye and forming an elongate 
prominent pad on each side of the head and neck. Upper 
and lateral parts, also the upperside of the thighs, covered 
with rather large tubercles, the remainder of the lind leg, the 
fore limb, and head being smooth. Lower parts coarsely 
granular, the largest granules are enclosed within the yellow 
patches about to be described. 
